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A140264 Inverse permutation to A140263. 5
0, 1, 2, 5, 7, 3, 6, 4, 8, 17, 19, 15, 23, 25, 21, 11, 13, 9, 18, 16, 20, 12, 10, 14, 24, 22, 26, 53, 55, 51, 59, 61, 57, 47, 49, 45, 71, 73, 69, 77, 79, 75, 65, 67, 63, 35, 37, 33, 41, 43, 39, 29, 31, 27, 54, 52, 56, 48, 46, 50, 60, 58, 62, 36, 34, 38, 30, 28, 32, 42, 40, 44 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..71.

Index entries for sequences that are permutations of the natural numbers

FORMULA

a(n) = A140266(n+1)-1.

PROG

(Scheme:) (define (A140264 n) (- (A140266 (+ 1 n)) 1))

(Python)

def a117966(n):

    if n==0: return 0

    if n%3==0: return 3*a117966(n/3)

    elif n%3==1: return 3*a117966((n - 1)/3) + 1

    else: return 3*a117966((n - 2)/3) - 1

def Z(z): return 2*z if z>0 else 2*abs(z) + 1

def a140266(n): return Z(a117966(n - 1))

def a(n): return a140266(n + 1) - 1 # Indranil Ghosh, Jun 07 2017

CROSSREFS

Inverse: A140263.

Sequence in context: A097964 A133133 A024710 * A140263 A073929 A076555

Adjacent sequences:  A140261 A140262 A140263 * A140265 A140266 A140267

KEYWORD

nonn

AUTHOR

Antti Karttunen, May 19 2008

STATUS

approved

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Last modified January 19 16:10 EST 2019. Contains 319307 sequences. (Running on oeis4.)